Oblicz.Pamietaj o kolejnosci dzialan.
a)2 5/9+ 1,4=
b)0,8* 5/16=
c)4 3/8*(1+0,3)=


Odpowiedź :

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Obliczenia

[tex]a] \ 2\frac{5}{9}+1,4=2\frac{5}{9}+1\frac{4}{10}=2\frac{5}{9}+1\frac{2}{5}=2\frac{25}{45}+1\frac{18}{45}=3\frac{43}{45}\\\\b] \ 0,8\cdot\frac{5}{16}=\frac{8}{10}\cdot\frac{5}{16}=\frac{\not4^1}{\not5_1}\cdot\frac{\not5^1}{\not16_4}=\frac{1}{4}\\\\c] \ 4\frac{3}{8}\cdot(1+0,3)=4\frac{3}{8}\cdot1,3=\frac{\not35^7}{8}\cdot\frac{13}{\not10_2}=\frac{91}{16}=5\frac{11}{16}[/tex]

Pozdrawiam! ~ JulkaOdMatmy

Cześć!

Szczegółowe wyjaśnienie:

a)

[tex]2 \frac{5}{9} + 1,4 = 2\frac{5}{9} +1\frac{4}{10} = 2\frac{5}{9}+1\frac{2}{5} =2\frac{25}{45} +1\frac{18}{45} =3\frac{43}{45}[/tex]

b)

[tex]0.8 \cdot \frac{5}{16} = \frac{4}{5} \cdot \frac{5}{16} = \frac{1}{4} [/tex]

c)

[tex]4 \frac{3}{8} \cdot (1+0,3) \\=\frac{35}{8} \cdot1,3= \\=\frac{35}{8} \cdot\frac{13}{10} =\\=\frac{7}{8} \cdot\frac{13}{2} =\frac{91}{16} =\boxed{5\frac{11}{16} }[/tex]